Portable grinding tool



Sept. 22, 1936. E. s. M GONEGAL PORTABLE GRINDING TOOL Filed March 7, 1936 2 Sheets-Sheet 1 ATTORNEYS Sept .22,1936. E, s, MCGONEG AL I V 2,055,302

PORTABLE GRINDING TOOL Filed March 7, 195's 2 Sheets-Sheet 2 I, INVENTOR. LRR $./7C6O/VEGAL BY /&2 MFAeMM ATTORNEY-5.

Patented Sept. 22, 1936 UNITED STATES PATENT OFFICE 2,055,302 PORTABLE GRINDING TOOL Err S. .McGonegal, Rutherford, N. J. Application March 7, 1936, Serial No. 67,568

I I 5 Claims.

The invention relates to portable grinding tools of the type disclosed in my prior United States Patent No. 1,756,949, and has for its object to provide a novel arrangement and construction in which the grin'dingtoo'land moreparticularly the grinding spindle and its associated elements may be easily adjusted to andset in the most efficient operativeposition. 'Othermore specific objects will appear from the description hereinafter and the features of novelty will be pointed out in the claims. I 1

In the accompanying drawings which illustrate an example of the" invention without'defining its limits, Fig. 1 is a sideelevation ofthe novel grinding tool; Fig. 2 is an end view thereof partly in section;.,Fig. 3 "is a plan view of the grinding tool partly in section; Fig. 4 is a sectional view on the line 4- 4 of Fig. 3; Fig. 5 is a detailed horizontal section on the line '5'--5 of Fig. 4 and Fig. 6 is a disassembled view showing .the parts of 'thespecificform illustrated in the drawings in separated relation toeach other.

In all of its forms the novel grinding tool comprises a'support on which the motor casing of a motor, is mounte'd so as to be rotatably adjustable on its axis relatively to said support. In addition the grinding tool includes a grinding spindle housing carried by the motor casing in external parallel relation thereto and partaking of the rotative movements of said motor casing relatively to the support and adjustable thereby to (different operative positions. In the specific form'shown in the drawings, the support comprises a split bearing ring ill provided with lugs H and set screws I2;for'causingsaidbearing ring to develop a clamping action onthe motor casing whereby the latter is fixed'in an adjusted position on the support. The motor casing in its illustrated -formconsists of two opposed sections l3 fitted together within the bearing ring H] as shown in Fig. 3, the sections I 3' of the motor casing being detachably connected with each ot'herjin any suitable'manner as by means of screws M. The operating parts of the motor are contained within the motor casing and include a motor spindle l5 which projects exteriorly of the motorcasing as shown in Fig. 3. In the illustrated example, the grinding spindlehousing consists bfjournals l6 each of whichis mounted upon one" of the sections l3' and preferably comprises an integral part of said section- 13-. In any case the journals I6 are located in external parallelrelation to the motor casingjin spaced axial registry with each other for the accommodation of the grinding spindle I! which is rotatably mounted in the A grinding spindle housing or more specifically, the journals iii in any conventional manner and pro- .iects therefrom at opposite ends. 'In addition to the parts so far described, the grinding tool includes a driving connection between the motor and the grinding spindle which is eiiective in all adjustments of the latter. As shown in the illustrated example this driving connection may comprise driving pulleys l8 and I9 located on the motor spindle l5 and on one projecting end of, a. guard 24 of any suitable type maybe mounted upon the tool so as to extend about the grinding wheel 2l as shown by dotted lines in Figsl-l and 3, and in solid lines in Fig.2.

The grinding tool preferably includes means for fixing the same in an operative position, for instance, upon a conventional lathe. In the illustrated example this means consists of a clamping block 2-5 provided with a preferably integral stud 2B threaded at its upper end to receive for instance a capstan-nut 21. As shown in Fig. 4 the stud 26 projects through an opening in a plate 28 suitably secured to a boss 29 forming part of the support or bearing ring 10 and provided withan open recess 30 for the-accommodation of the capstan-nut 21. or its equivalent.

To mount the grinding tool upon a lathe it is simply necessary, for instance, to remove the customary tool post from the tool post carrier 3| and to introduce the vclampingblock 25 into the conventional undercut groove 32 of said carrier 3|. After the tool has been set in the desired position upon the carrier 3| itmay be fixed in such position by simply tightening the capstannut 21 on the stud 26 as will be apparent.

When thus mounted upon the lathe, the bear-' 1 ing ring It! or its equivalent, and the motor casing with its associated elements are firmly and rigidly fixed upon the compoundflrest of the lathe. In this position the grinding spindle l1 and consequehtly the grinding tool 2| may be adjusted to the most eflicient operating position or to any position within its range of adjustment by simply rotating the motor casing sections I3 as aunit relatively to the support It) or specifically within the bearing ring I!) about the axis of the motor. It will be understood that the set screws |2 are first loosened to permit such rotative adjustment of the motor casing and that said set screws l2 are again tightened when the desired adjustment has been reached to fix the parts in their adjusted positions. Because of the fact that the grinding spindle housing or specifically the journals l6 are carried by the motor casing sections I3, the grinding spindle I! and its associated elements will partake of the rotative movements of the motor casing relatively to the support, or in other words, in the bearing ring |0 so that the grinding spindle I1 is adjustable with the journals l6 about the axis of the motor to diiferent operative positions in external radial relation to the motor casing. As the movements of adjustment of the grinding spindle I! and its associated said spindle I] has been adjusted. By reason of being mounted upon the compound rest of a lathe as in the illustrated example,

thegrinding wheel 2| or its equivalent, will have the additional advantage o-fthe varied and compound adjustments which are possible through the medium of said compound rest. The latter may be of any conventional construction and mounted on the lathe bed33 in any well-known way, the customary crank handle 34 and co-operating means being provided for adjusting the slide 35 of the lathe on the saddle 36 thereof; in addition, the usual crank handle 31 and associated elements are present in the lathe for adjusting the tool post carrier 3| on the slide 35, it being further understood that the carrier 3| is also adjustable in circular directions in the well-known way. r V I With the arrangement illustrated anddes'cribed 'thenovel grinding tool may be easily and quickly "mounted upon a conventional lathe in a most eflicie'nt position and may be easily adjusted as required by the customary adjusting mechanisms of said conventional lathe to efiect a performance of maximum efliciency. In addition the grinding tool spindle and the grinding tool carried thereby J5 ;as shown in the drawings this means may may be readily adjusted to its most'efl'lcient operating position relatively to the means whereby the grinding tool is fixed in operative position regardless of the adjustments of the tool as a whole on the lathe.

It will of course be obvious that the novel portable grinding tool illustrated and described herein may bemounted on othermachines or otherwise as occasion may require without affecting any of its advantages.

v If. desired, provision may be made to exclude dust and other foreign matter from the grinding spindle housing or more specifically thejournals consist of asleeve 38 fitted about the spindle between the journals l6 and covered externally by a plate 39 which may comprise a name plate and in any case may be suitably fixed in place 7 as by means of screws 40.

Various changes in the specific forms shown and described may be made within the scope fthe claims without departing from the spirit of the invention.

. motor casing,

I claim: 4

1. A portable grinding tool comprising a split bearing ring constituting a support, means car-- ried by said ring for fixing the same in supporting position, a motor including a motor casing consisting of two opposed detachably connected sections fitted together within said bearing ring and rotatable therein, a grinding spindle housing carried by said motor casing in external parallel relation thereto and partaking of the rotative movements of said motor casing in said bearing ring, a grinding spindle journalled in said grinding s'pindle housing and extending across said bearing ring, said grinding spindle being adjustable with said grinding spindle housing about the axis of said motor to different operative positions relatively to said fixing means, and a driving connection between said motor and said grinding spindle efi'ective in all adjustments of the latter. I 2. A portable grinding tool comprising a split bearing ring constituting a support, means carried by said ring for fixing the same in supporting position, a motor including a motor casing consisting of two opposed detachably connected sections fitted together within said bearing ring and rotatable therein, said motor casing projecting in opposite axial directions beyond said bearing ring, bearing sections carried respectively by said motor casing sections at opposite sides of said bearing ring in spaced axial registry with each other and together constituting a grinding spindle housing, said bearing sections partaking of the rotative movements of said motor casing in said bearing ring, a grinding spindle journalled in said bearing sections and extending externally across said bearing ring, said grinding spindle being adjustable with said grinding spindle housing about the axis of said motor to difierent operative positions relatively to said fixing means, and a.

drivingconnection between said motor and said grinding spindle effective in all adjustments of the latterr 3. A portable grinding tool comprising a split bearing ring constituting a support, means carried by said ring for fixing the same in supporting position, a motor including a motor casing consistingof two opposed detachably connected sections fitted together within said bearing ring and rotatable therein, bearing sections located in spaced axial registry with each other at opposite sides of said bearing ring in external parallel relation to said motor casing, said bearing sections each comprising an integral part of one of said'motor casing sections and partaking of the.

rotative movements of said motor casing in said bearing ring, a grinding spindle journalled in I said bearing sections and extending externally across said bearing ring, said grinding spindle being adjustable with said bearing sections about the axis of said motor to different operative posi-- tions relatively to said fixing means, and a driving connection between said motor and said grinding spindle-efiective in all adjustments of the latter.

4. A portable grinding tool comprising a sup port, a motor-including a motor casing carried ,by said support and rotatably adjustable thereon about'the motor axis, grinding spindle journals carried by said motor casing in spaced axial registry and in external parallel relation thereto and partaking of the rotative adjustments of said a grinding spindle rotatably mounted in said journals in parallel relation to the motor axis and adjustable with said journals I about said motor axis to different operative positions relatively to said support, and a driving connection between said motor and said grinding spindle effective in all adjustments of the latter.

5. A portable grinding tool comprising a support, a motor including a motor casing carried by said support and rotatably adjustable thereon about the motor axis, grinding spindle journals comprising integral parts of said motor casing in spaced axial registry and in external parallel rela- 10 tion thereto and partaking of the rotative adjustments of said motor casing, a grinding spindle rotatably mounted in said journals in parallel relation to the motor axis and adjustable with said journals about said motor axis to difl'erent operative positions relatively to said support, and a driving connection between said motor and said grinding spindle effective in all adjustments of the latter.

s. MCGONEGAL. 

